Mining machine



18', 1939. l cH L 2,166,569

MINING MACHINE Original Filed May 2, 1932 10 Sheets-Sheet 1 /NVENTOR:Lewis E. Mifche/l ATT 'Y y 1939. E. MITCHELL 2,166,569

MINING MACHINE Original Filed May 2, 1932 10 Sheets-Sheet '2 INVENTOR:Lew/'5 E. Mhchel/ HTT'Y July 18, 1939.

L. E. MITCHELL 2,166,569

MINING MACHINE Original Filed May 2, 1932 10 Sheets-Sheet 3 um (0 5 u- 8h \9 -J P '//'Z/ [4. F I// H K w -m :2 Q I g 3 g .x E :0

P m w 'I 5 2 I I Q g 4& r n n 3 1s} 9 E N n r \11 v //-/vE/-/T0R: gLewis E. M/fchel/ B a 3 HTT'Y July 18, 1939. L. E. MITCHELL MININGMACHINE Original Filed May 2; 1932 10 Sheets-Sheet 4 ATT'Y.

July 18, 1939. L. E. MITCHELL MINING MACHINE l0 Sheets-Shept 5 OriginalFiled May 2, 1932 G l a 7 e m E: y R 0 M m m J F E E :3. V 5 M Y e L B.n. 4 m l m E s l'ul\\ HTT'Y y 1939- L. E. MITCHELL 2,166,569

MINING MACHINE Original Filed May 2, 1932 10 Sheets-Sheet 6 3 /NVENTOF?:)1 Lewis E. Mifchell,

' HTT'Y E. MITCHELL MINING MACHINE July 18, 1939.

Original Filed May 2, 1932 10 Sheets-Sheet 7 I 10 sheet-sneeig a July18, 1939. E. MITCHELL MINING MACHINE Original Filed May 2, 1932 k. on

y 1939. E. MITCHELL I 2,166,569

MINING MACHINE Original Filed May 2, 1932 10 Sheets-Sheet 10 I45 El 25'4 e7 v 1: a GI 27 Z a-r 6 E k as 36 1 //Yl/ENTOR.' V

. 5 w a HT 'Y Patented July 18, 1939 UNITED STATES PATENT OFFICE MININGMACHINE poration of Ohio Application May 2, 1932, Serial No. 608,585Renewed March 8, 1939 40 Claims.

My invention relates to mining machines particularly of the type adaptedto travel on a mine track and remain thereon to be braced thereby duringoperation.

One of the objects of my invention is the provision of an improved andefficient mining machine which shall have a minimum overall height andbe Very compact to operate in a relatively low roof mine chamber.

Another object of the invention is the provision of improved andefiicient mechanism for supporting and adjusting a Keri-cutter on ahorizontal axis from a horizontal plane at the level of the mine floorto a horizontal plane above the mining machine but adjacent the same foroperation in a relatively low roof mine chamber. A further object of theinvention is the provision of improved mechanism for detachably mountinga self-contained power-operated drilling machine on the outer endportion of an elongated cutter bar which is adjustably mounted on atruck adapted to travel on a mine track so that Whenever desired themining machine may be used to support the drilling mechanism in any oneof many different positions at the coal face.

Another object of the invention is the provision of a demountable drillon a mining machine cutter bar so that the various adjustments of thecutter bar may be taken advantage of to support the drilling mechanismin position to command the entire area of the working face.

Another object of the invention is the provision of a universallymounted drill on a universally mounted elongated support to efiectadjustment of the drill for operation universally with respect to thecoal face and with respect to the ribs at the sides of the mine entry inwhich the machine is adapted to operate.

Other objects of the invention will appear hereinaiter, the novelfeatures and combinations being set forth in the appended claims.

In the accompanying drawings Fig. 1 is an elevational view of myimproved mining machine including the self-contained power-operateddrilling mechanism demountably attached to the outer end portion of theelongated cutter bar;

Fig. 2 is a plan View of the complete mining machine shown in Fig. 1showing the mechanism for swinging the cutter bar and adjusting theposition of the drill on the vertical axis of the turntable;

Fig. 3 is a bottom plan View of the structure shown in Figs. 1 and 2. toshow the power-operated mechanism for varying the elevation of thecutter bar and the drill relative to the truck on which the turntable ismounted;

Fig. 4 is a detailed view of the individual screw post elevatingmechanism for the turntable, including an individual controlling clutchto secure variation of inclination of the cutter bar and the drill oneither a longitudinal axis of the turntable or a horizontal transverseaxis thereof;

Fig. 5 is a longitudinal enlarged sectional elevation of that portion ofthe mining machine shown in Fig. 1 which embodies the turret forswinging the cutter bar on a lowered horizontal longitudinal axiscombined with an additional turret for swinging the cutter bar in itsown plane and thereby adjusting the drill when the latter is mounted onthe outer end portion of the cutter bar;

Fig. 6 is an enlarged plan view of the righthand portion of thestructure shown in Fig. 5;

Fig. 7 is a sectional elevation of the controlling mechanism shown inplan at the upper lefthand portion of Fig. 6;

Fig. 8 is the sectional plan view taken on the line 8-8 of Fig. 7

Figs. 9 and 10 are more or less diagrammatic views to illustrate thepower transmission and control mechanism for swinging the turrets ontheir respective axes;

Fig. 11 is an enlarged sectional elevation taken as indicated by theline H--l| of Fig. 9 looking in the direction of the arrows;

Fig. 12 is an enlarged sectional elevation taken as indicated by theline I2l2 of Fig. 9 looking in the direction of the arrows;

Fig. 13 is an enlarged sectional elevation to show the clutchcontrolling mechanism for the power transmission from the motor on theturntable to the turret rotatable on the horizontal axis shown in Fig.5;

Fig. 14 is an elevational view of the manual mechanism for operating thedisc clutch shown in Fig. 13;

Fig. 15 is a sectional elevation taken on the line l5l5 of Fig. 14looking in the direction of the arrows;

Fig. 16 is a sectional elevation taken on the line Iii-16 of Fig. 14looking in the direction of the arrows;

Fig. 17 is an elevation of a self-contained power-operated drillingmachine detachably mounted on the cutter bar of the keri-cutting miningmachine shown in Fig. 1; I

Fig. 18 shows an outer end view of the drilling machine shown in Fig.1'7 with the demountable attaching mechanism and the cutter bar insectional elevation on the line |8--|8 of Fig. 1'7 looking in thedirection of the arrows;

Fig. 19 is a diagrammatic plan view to illustrate various positions ofthe drill when the cutter bar occupies a horizontal plane;

Fig. 20 is a diagrammatic plan view to illustrate the various positionsof the drill when the cutter bar occupies a vertical plane;

Fig. 21 is a diagrammatic elevational view to illustrate the variousadjustments in elevation of the drill when the cutter bar is in avertical plane;

Fig. 22 is a diagrammatic elevational view to illustrate adjustment ofthe drill by inverting the cutter bar from a horizontal plane adjacentthe top of the machine to a horizontal plane at the floor of the minechamber in advance of the mine track;

Fig. 23 is a diagrammatic elevational view to illustrate the adjustmentof the drill from its lowest position to its highest position byinverting the cutter bar from its lower horizontal position to its upperhorizontal position when the turntable is elevated to its highestposition;

Fig. 24 illustrates diagrammatically adjustment of the drill to aposition spaced back from the face of a rib and parallel thereto; and

Fig. 25 is a diagrammatic illustration of adjustment of the drill foroperation at right angles to a rib extending parallel to the mine track.

By referring to Figs. 1 and 2 it will be seen that the kerf cuttingmining machine which may be converted into a drilling machine bydetachably mounting the self-contained power-operated drill 26 on theouter end portion of the cutter bar 21 comprises a truck frame 28mounted on wheels 29, 29 which are adapted to travel on the mine track30 and be laterally braced thereby during feeding movements of thecutter bar while the drilling machine 26 is demounted therefrom. Thekerf cutting machine may be of the type shown in the Levin patent, No.1,354,054, granted September 14, 1920, for an Improvement in miningmachines, which includes a turntable, a cutter bar connected thereto torotate therewith on an upright axis, mechanism for swinging theturntable and the cutter bar on such upright axis relatively to thetruck and power-operated mechanism for varying the elevation andinclination of the turntable and the cutter bar relative to the truck.

The kerf cutting mining machine shown in Fig. 1 also includes apparatusoperated by an electric motor 3| on the truck frame 28 for propellingthe mining machine along the mine track 30 at a transport speed or at aslow feeding speed. A motor 32 is mounted on the turntable 33 to rotatebodily therewith and is connected to rope gearing comprising the rope 34for swinging the turntable together with the cutter bar relatively tothe truck on the upright axis of the turntable.

The truck propelling mechanism is shown in bottom plan view in Fig. 3and comprises the sprocket chain 3! to which the motor 3| is connectedthrough the speed reduction gearing 3|". The motor 3| on the truck frame38 is also connected to the cable reel 35 which pays out or winds up theelectric cable 36 for conducting electric power from a distant source ofsupply to the motor 3| on the truck, the motor 32 on the turntable andthe motor 31 of the drilling machine shown in elevation in Figs. 1 and17.

The mechanism for elevating the turntable together with the cutter barand the drilling machine mounted on the latter is shown in Fig, 3 andcomprises the sprocket chain 38 for rotating the vertical screw posts39, 39, 39. Power may be transmitted to these screw posts individuallyas shown in Fig. 4 so as to effect variation of inclination of theturntable, the cutter bar, and the drilling machine on either alongitudinal axis of the turntable or a horizontal transverse axisthereof.

The armature shaft 40 of the motor 32 on the turntable extendshorizontally forward and radially of the turntable as shown in Fig. 2.

At the forward end of the armature shaft 40 as shown in Fig. is a bevelpinion 4| which meshes with a horizontal bevel gear 42 secured to thevertical shaft 43 which is journalled in the bearing 44 of the auxiliaryframe 45 rigidly secured to the turntable 33. Secured to the upper endof the vertical shaft 43 is a bevel gear 46 which meshes with a bevelgear 41 mounted on the left-hand end of the horizontal shaft 48journalled in the frame 45. The bevel gears 46, 4! may be lubricated byoil from the closed chamber 48 through the nozzle 49. The journalbearings for the horizontal shaft 48 may be lubricated by oil from theclosed chambers 50, 5| through the oil holes 52, 53. A cover plate 54closes the chambers 48, 50 and 5| and the lubricant in these chambersmay be replenished by removing the screw plugs 52, 53 and 54.

At the right-hand end of the horizontal shaft as viewed in Fig. 5 issecured a gear 55 which meshes with a gear 56 on the left-hand end ofthe shaft 51 which is offset from the horizontal shaft 48 but is in thesame vertical plane therewith whether or not the cutter bar is in ahorizontal plane. The axis of the shaft 51 is also offset from thehorizontal axis of the motor shaft 40.

As will be hereinafter explained the shaft 5'! is journalled in theturret frame 58 which is rotatable relatively to the auxiliary frame 45on the horizontal axis of the shaft 51. At the right-hand end of theshaft 51 is a bevel gear 59 which meshes with the horizontal bevel gear60 as viewed in Fig. 5. The gear 60 is journalled loosely on the shaft6| and the latter is journalled in the bearing 62 of the cap 63 securedto the turret 58. The shaft 6| is also journalled at its lower portionin the bearing 64 which is secured rigidly to the second turret frame65. The second turret B5 is mounted for rotation on the axis of theshaft 6| relatively to the first turret 58.

Rigidly connected to the lower end of the turret 65 is the cutter bar 21in position to occupy a plane at right angles to the axis of the shaft6|. Guided along the periphery of the elongated cutter bar 21 is anendless cutter chain 66 which meshes with the driving sprocket 61secured to the lower end of the shaft 6|. By means of the clutch 68 thebevel gear 60 may be connected to the shaft 6| to drive the sprocket 61and the chain cutter 66. The clutch 68 may be manually operated fromeither side of the machine by means of one of the levers 69, 69 shown inFigs. 1 and 6. By moving one of the levers 69 the rockshaft will actuatethe shipper H to throw the clutch 68 in or out, as shown in Fig. 5.

In order to rotate the turret 58 on the horizontal axis of the shaft 51power transmission mechanism is arranged between the gear 55 and theworm gear 12 which is rigidly connected to the turret frame 53. Byreferring to Fig. which is a sectional view taken on the line |5--|5 of1 cover plate.

Fig. 5 looking in the direction of the arrows or on the line I5-I5 ofFig. 14 looking in the direction of the arrows, it will be seen that thegear 56 meshes with an idler 12 and that the latter meshes with a gear13 which in turn'may be connected to the shaft 14 by means of thefriction clutch 15 as shown in Fig. 13.

The friction clutch 15 may be thrown in or out by means of the lever 16as shown in Fig. 14. The lever 16 is pivoted at 11 and is provided withan adjustable screw 18 held in fixed position by the nut 19 so as toengage the upper end of the actuating arm which is urged against thescrew 18 by the spring 8|. The lower end of the actuating arm 80 iskeyed to the rockshaft 82 which extends into the housing 83 rigidlyconnected to the depending supporting bracket 45' on the auxiliary frame45. Within the housing 83 (Fig. 16) is a shipper 84 connected to theclutch operating element which is shown in Fig. 13 in position to movethe outer set of discs of the friction clutch toward the annular flange86 of the clutch element 81. The inner set of friction discs isconnected to rotate with the clutch element 81 which is keyed to theshaft 14. The outer set of friction discs is connected to the clutchelement 88 which is secured to the gear I3 to rotate therewith.Therefore when the motor 32 on the turntable 33 is operated in onedirection or the other power will be transmitted through the train ofgearing shown in Figs. 5 and 15 to the clutch element 88 and when thelever 16 is actuated to apply the friction clutch I5 the shaft 14 willbe rotated accordingly.

Mounted on the shaft I4 is a warm 89 which meshes with a worm wheel 90,the latter being keyed to the shaft 9|. As shown in Figs. 5 and 9 theshaft 9i carries a worm 92 which meshes with the large worm gear securedto the turret frame 58. Therefore when the friction clutch 15 is appliedto transmit power to the shaft 9| from the motor 32 on the turntable theturret frame 58 will be rotated on the axis of the shaft 51 while heldin place by the annular retaining bearing 93. In other words, therotation of the turret frame 58 will be on the offset support 45 on theaxis of the shaft 51 which is offset from the axis 48. Consequentlysince the shaft 51 is in vertical plane that extends through the shaft48 and occupies a position below the axial line of the latter the chainkerf-cutter may more readily occupy a horizontal position at the floorlevel as illustrated in dotted lines in Fig. 22. Furthermore, by reasonof the offset position of the shaft 51 the turret 58 may be rotated on arelatively low axis so that the cutter bar when inverted to its fullline position shown in Fig. 22 will occupy a position a short distanceabove the upper side of the It will also be seen that by reason of therelatively low axis of the shaft 51 the drill when in its full lineposition shown in Fig. 22 will occupy a position approximately midwaybetween the floor and roof of the mine chamber.

After the chain kerf-cutter has been adjusted on the axis of the shaft51 either to any one of its horizontal positions or to any one of itsvertical positions such as those shown in Figs. 20 and 21 or to anyintermediate inclined position, the friction clutch "I5 may be releasedby releasing the lever 16 whereupon the spring M will separate the setsof friction discs sufficiently to permit the self-locking worm gearing89, and 92, 12 to very effectively hold the kerf-cutter and the drillingmachine mounted thereon in the adjusted position.

In order to swing the kerf-cutter on the axis of the shaft BI in eitherdirection at a feeding speed, power transmission mechanism is connectedbetween the bevel gear 60 and the large worm wheel 94 which is securedto the cutter bar turret as shown in Fig. 5. Secured to the upper sideof the bevel gear 60 as viewed in Fig. 5 is an eccentric cam 95encircling which is the circular strap 96 provided with a radial arm 91to the outer end of which is pivoted at 98 the ratchet pawl mechanism 99as shown in Fig. 11. A retaining plate I00 is secured by means of thecap screws IM to the eccentric cam 95 and is of sufficient diameter tooverlap a portion of the circular strap 96 as shown in Fig. 5.

The pawl and ratchet mechanism is shown in detail in Figs. '7 and 11 andis diagrammatically illustrated in Fig. 9. This pawl and ratchetmechanism is mounted in a housing I02 which is provided at its upperside with a closure I03. Reversely arranged ratchet wheels I04 and I05are confined between a shoulder at the upper end of the shaft I06 andthe circular plate I01 which is secured by means of the cap screw I08 tothe upper end of the shaft I09 of reduced diameter. Mounted on theinverted cup-shaped support IIO are the reversely arranged pawls III andH2 which are pivoted to the support IIO on the pin II3 A spring II4between the arms H5 and H6 extending from the pawls III and H2 urge thelatter toward their respective ratchet wheels I04 and I05.

Between the cup-shaped support H9 and the ratchet wheels I04, I 05 islocated a cylindrical pawl releasing device II! which is provided withopenings H8 and IIS' as shown in Figs. 9 and 11. The upper centralportion of the cup-shaped pawl releasing device In as shown in Fig. 7,is connected to the shaft I I9 which is journalled in the sleeve I20 atthe upper central portion of the cup-shaped support I II]. To the upperend of the shaft I I9 is secured an arm IZI the outer end of which isprovided with a support I22 for the spring pressed pin I23 the upper endof which is provided with a knob I24 and the lower end of which mayextend into one of the depressions I25 in the plate I25 secured to theupper side of the cap or cover I03. When the lever I2! is moved in onedirection one of the pawls III or II2 will be thrown out of engagementwith its ratchet wheel and the other pawl will be permitted to engageits ratchet wheel and the position of the lever I 2| will determine theposition of the pawl releasing device II! to regulate the extent ofmovement of the ratchet wheel upon each rotation of the eccentric cam95. That is to say, the extent of feed in either direction of swingingmovement of the cutter bar may be regulated. Whether the shaft I 06 isrotated in one direction or the other the actuated ratchet wheel will beheld against reversal when its pawl reverses, by the adjustable brakemechanism shown in Figs. '7 and 8, comprising the brake band I21 whichis associated with the brake wheel I28 secured to the lower end of theshaft I06. As shown in Fig. 7 the shaft I06 is journalled in a bearingI29 of a block I30 secured at I3I to the housing I02. Inasmuch as thepawls are reciprocated upon rotation of the cam 95 the frame I I0 hasits sleeve I20 on its upper side mounted in the bearing I32 while thelower portion of the support H0 is secured to the annular member I33journalled in bearings on the block I30.

The lower end of the shaft I06 is provided with a bevel gear I34 whichmeshes with a bevel gear wheel I35 on the shaft I36. As shown in Fig. 12the shaft I36 is journalled in the bearings I31 and I38 and carries aworm I39. The relation of the parts between the eccentric cam 95 and theworm I39 is diagramatically illustrated in Fig. 10.

As shown in Fig. 12 the bevel gear I35 is connected to the circularplate I40 by means of a shear pin MI and the plate I40 is keyed to theshaft I36. By means of the cap screw I42 the plate I40 is retained inplace on. the shaft I36 and the same cap screw may be used to retain inplace the keeper I43 for the shear pin I4I. Since the worm I39 mesheswith the large worm gear 94 swinging feeding movement of the kerfcutting mechanism is effected by operation of the worm gearing I39 and94. If the cutter bar should engage unusually hard material such as asulphur ball or if the feed should be inconsistent with the hardness ofthe material the pin I4I will be sheared in two to protect the powertransmission mechanism. Such shearing of the pin I4I will not interferewith the self-locking feature of the worm gearing I39, 94 to hold thecutter bar 21 in interlocked relation to the first turret frame 58.

The track mounted mining machine may be operated in various ways toproduce kerfs either in horizontal planes or in vertical planes or inintermediate inclined planes all at right angles to the working face.Traction feed may be effected by controlling the truck propellingmechanism to move along the mine track at feeding speed. The cutter barmay be adjusted in elevation and in inclination by the mechanismassociated with the three screw posts 39 between the truck frame and thesupport for the turntable. The cutter bar may be swung arcuately eitheron the turntable axis or on the axis of the shaft 6I. When the plane ofthe cutter bar is parallel to the mine track sumping and withdrawal cutsmay be made either in upright planes or in horizontal planes or inintermediate inclined. planes. The flexibility of the mining machineenables the latter to produce kerfs over a wide range and consequentlyit is desirable to provide a wide range of flexibility of positioning ofthe drilling mechanism so that drill holes may be produced to mosteffectively enable the blasting charges to co-operate with the kerfs todislodge the coal with a maximum amount of lumps and a minimum amount ofslack.

A self-contained power-operated drilling machine is thereforedemountably attached to the outer end portion of the cutter bar 21 asshown in Fig. 1. Such self-contained power-operated drilling machine maybe of the type shown in the Trotter patent, No. 1,087,089, grantedFebruary 10, 1914, for an improvement in Drills.

In the drilling machine shown in Fig. 1'7 the electric motor 31 may becontrolled by an electric switch operated by means of the lever I44. Therotation of the drill I45 together with the drill socket and holder I46may be controlled by the mechanism operated by the rotatable knob I41.The feed screw I48 extends entirely through the supporting structure andis guided at the rear of the drill frame by means of the tube I49. Therotation of the drill and the feed thereof into the coal face as Well asthe withdrawal therefrom is effected by rotation .of the feed screw I48the operating mechanism of which is driven by the electric motor 31under the control of the actuating knob I". The feed of the drill is ofcourse axial and so also the withdrawal thereof from the drill hole.

The frame I50 of the drilling machine is provided with a lateralsupporting bracket I5I which is provided with an arcuate flange I52fitting into a circular guide groove I53 of the circular track I54.

The track I54 may be composed of semi-circular plates I55, I55 each ofwhich is detachably connected by means of the bolts I56, I51 to theupright plate I58 .of the L-shaped standard I59. The bolts I56 and I 51are screw threaded into the circular plate I60 which is encompassed bythe circular track I54. The circular plate I60 is concentric with thetrack I54 and of such diameter as to afford a circular space I6I fortravelling of the flange I52 which is L-shaped in cross section as shownin Fig. 18. It will thus be seen that the circular plate I66 locks theflange I52 in the groove I53 so that the drilling machine is lockedagainst withdrawal from the upright plate I58 of the standard I59.However, the drilling machine is free to be tilted manually on ahorizontal axis which extends at right angles through the center of theplate I66. The friction between the flange I52 and the track I54 may besufficient to hold the drilling machine in adjusted position prior tothe starting of the drill into the coal face.

The horizontal plate I62 of the standard I59 is provided with a verticalpin I63 which is adapted to extend through openings in the upper andlower plates of the cutter bar 21. The lower end of the pin I63 is screwthreaded at I64 to receive a nut I65. A yoke I66 is pivoted at I6! tothe nut I65 and is provided with an actuating arm I68. By means of thearm I68 the nut I65 may be tightened to secure the standard I59 inadjusted position on the cutter bar. Since the yoke I66 is pivoted atI61 the arm I68 may be swung 180 to the opposite side of the cutter barfor convenience in operation of the nut I65.

It should be particularly noted that adjustment of the drilling machinerelative to the cutter bar may be made on intersecting axes which extendat right angles to each other. When the cutter bar is in a horizontalposition such as that shown in Fig. 18 the adjustment of the drillingmachine may be made on the vertical axis of the pin I63 and on ahorizontal axis extending through the center of the plate I 66 orconcentrically of the track I54. The drilling machine may be detach-'ably mounted on either side of the cutter bar and by providingadditional holes or openings through the cutter bar the drilling machinemay be mounted at various distances from the outer end of the cutterbar. For instance, in Figs. 24 and 25 the drilling machine may bemounted as shown in full lines or in the position indicated by theperforation I69. It is preferred, however, to mount the drilling machineadjacent the outer end of the cutter bar so as to enable the latter toafford an elongated support which will reach a considerable distancefrom the truck of the mining machine While the latter remains on themine track and that such extended positioning of the drilling machinemay be effected at various angles. Not only is the elongated supportuniversally mounted but the drilling machine itself is adjustable tovarious positions on intersecting axes which extend at right angles toeach other. The drilling machine may therefore be effectively supportedto command the entire coal face for axial feeding either at right anglesto the coal face or at any oblique angle relative thereto since the feedof the drill is axially thereof While the supporting framework of themining machine remains stationary on the mine track.

During the operation of the drilling machine slipping may occur betweenthe arcuate flange I52 and the circular track I54 and likewise betweenthe horizontal plate I62 and the adjacent plate of the cutter bar. Thecutter bar acting as an elongated support for the drilling machine islocked in stationary position by the self-locking worm gearing I39, 94and. 92, 12.

In order to retain the cutter bar locked in a stationary position at anadjusted angle the mechanism shown in Fig. 16 is preferred. Duringmining operations vibrations of the cutter bar maytend to cause creepingbetween the worm gear elements and to prevent this I have mounted aspring-pressed brake as shown at I18 in Fig. 16 to act against anannular flange I1I on a nut I12 which is screw threaded to the extensionI13 and pinned thereto at the left-hand end of the worm shaft 9|. Theshaft BI is mounted in the bearings I14 and I15 in the casing I16 whichis secured rigidly to the neck I11 as shown in Fig. 5. The casing I18and the neck I11 are rigidly connected to the depending bracket 85' andthe latter in turn is rigidly connected to the auxiliary frame 45 fixedto the turntable 33. The mechanism for swinging the turntable on avertical axis relatively to the truck is also provided with self-lockingworm gearing to hold the turntable locked to the truck when it isdesired to hold the cutter bar stationary relative to the truck.

By referring to the diagrammatic views of Figs. 19 to 25, inclusive, thevarious adjustments of the mining machine to secure the desiredpositioning of the drilling machine will be understood. Fig. 19illustrates adjustment of the cutter bar 21 on the vertical axis I18 ofthe turntable and on the axis 8| at the rear end of the cutter bar toenable the drilling machine to drill holes at an angle in its full lineposition and close to the ribs I19 and I88 in their dotted linepositions. By firing the blasting charge in the intermediate drill holeslightly in advance of the firing of the charges in the dotted drillholes the coal will be more efficiently dislodged.

In Fig. 19 the cutter bar is in horizontal position or in such inclinedposition as will be permitted by the screw posts on the truck frame butthe elevation of the cutter bar together with the drilling machine maybe varied as illustrated in Figs. 22 and 23.

By mounting the drilling machine on that side of the cutter bar remotefrom the turrets the drill holes may be adjacent the plane of the flooras shown in Fig. 23 or adjacent..the plane of the roof as shown indotted lines. The change in position may be effected by turning over theturrets to invert the cutter bar.

By mounting the drilling machine on that side of the cutter bar adjacentthe turrets, drill holes in horizontal planes may be produced at variouselevations one of which, as shown in full lines in Fig. 22, is midwaybetween the floor and roof.

In Fig. 23 the turntable is shown in an elevated position relative tothe truck whereas in Fig. 22 the turntable is in its lowermost position.On account of the lower position of the shaft 51 of Fig. or of the axisof the neck I11 on which the horizontal turret 58 turns, drilling, asshown in Fig. 2, may be effected in a relatively low roof mine roombecause of the relatively low position of the cutter bar adjacent theplane through the top of the turntable and because the drilling machineis mounted on the bottom of the cutter bar.

Drilling in still lower roof mine rooms may be carried on when thecutter bar is adjusted to its upright plane. By reason of the offsetaxis of the shaft 51 the turret 58 may remain below the plane extendingthrough the top of the machine. That is to say, when the turntable is inits lowermost position and the shaft BI is horizontal to extend fromeither side of the shaft 51 the overall height of the entire machine isno greater than the top of the turntable. Consequently the machine maybe used for making drilling holes in any position extending entirelyacross the working face and at any elevation between the floor and theroof, in a very low roof mine room. A plurality of shearing or verticalcuts may also be made in such low roof mine room when the drillingmachine is demounted from the cutter bar. Furthermore, when the cutterbar is in an upright plane it may support the drilling machine foroperation in high roof mine chambers as shown in Fig. 21. In fact theheight of the roof may vary from that in which the machine may becleared when the turntable is in its lowermost position to that in whichthe height may be at the upper end of the cutter in an upright plane andextending vertically upward.

The width of the mine entry or room may vary from a narrow place to onetwice the radial distance from the turntable axis to the outer end ofthe cutter bar.

The adjustments on the turntable axis and on the axis at the rear end ofthe cutter bar may also be taken advantage of to support the drillingmachine to drill a hole spaced back from the rib I8I as shown in Fig.24, or to drill a hole at right angles to the rib I82 as shown in Fig.25. In all of the operations of the drilling machine illustrated inFigs. 19 to 25, inclusive, the supporting framework remains instationary position on the mine track, the feed of the drill alwaysbeing axially of the drilling tool.

All of the adjustments of the cutter bar as to elevation and inclinationare made by self-contained power-operated mechanism and after suchadjustments have been made the drilling machine is manually adjustedrelative to the cutter bar and the supporting standard I59 manuallysecured in adjusted position by means of the handle on the opposite sideof the cutter bar. The final adjustment will be on the transversesupporting axis of the drilling machine frame. During operation thedrilling machine will be yieldingly held on its intersecting axesrelative to the cutter bar while the latter is held rigid andstationary.

In order to lock the turntable 33 to the ring I83 (Fig. 1) which ismounted on the adjusting screw posts 39, looking devices I88 areassociated with the notches I85 in the periphery of the turntable 33.The ring I83 is carried by the pedestals I85 which depend therefrom anda nut I86 is threaded on the screw post 38 as shown in Fig. 4. By meansof the lever I81 the clutch I88 may be operated to control individualelevation of the nut I86 and the pedestal I85, the sprocket I89 beingconnected to the vertical screw post 39 to rotate therewith.

By referring to Figs, 1 and 23 it will be seen that the overall heightof the drilling machine is relatively low and the machine is thereforeadapted to operation in a low roof mine chamber. However, the samemachine may be operated in high roof mine chambers because of the highreach afforded by the arm 21 which is adjustable on the axis 6| as shownin Fig. 21. The boom 58 shown in Fig. 5 is mounted on the truck forhorizontal swinging movement on the vertical axis I18 of the turntable33. The axis 6I on which the arm 21 is swingable extends at right anglesto the horizontal axis 51 of the boom. When the axis GI is horizontalthe arm 21 may be moved in a vertical plane to inclined positionsextending upwardly or downwardly relative to the horizontal and held atsuch adjusted inclinations.

As shown in Fig. 18 the drilling implement is adjustably mounted on thearm 21 for adjustment relative thereto on rectangularly related axes I63and I52. The axis I63 is permanently at right angles to the arm 2'! andtherefore permanently parallel to the axis 6|. The axis I52 ispermanently at right angles to the axis of the drill. Consequently,whenever the axis GI is horizontal and the arm 21 is inclined upwardlyor downwardly as shown in Fig. 21 and the drill is parallel to the minetrack and perpendicular to the working face, the axis I52 will bevertical. The adjustment of the drill to such right angle position whenthe arm 21 is inclined upwardly or downwardly is on rectangularlyrelated axes one (I52) of which is vertical and at right angles to thedrill axis and the other (I63) of which is horizontal and parallel tothe axis BI.

By rotating the boom 58 on the horizontal axis 51 through an angle of180 the arm 21 with the drilling implement thereon may be inverted tolocate it in a horizontal plane adjacent to the mine bottom or in ahorizontal plane adjacent to the mine roof as shown in Fig. 23. In asimilar manner inversion of the arm 21 enables the drill to be locatedin vertical planes adjacent to the opposite ribs as shown in Fig. 20. Inaddition to the positions of the drill at right angles to the workingface as illustrated in Figs. 20 and 23, the drill may be adjusted to aposition at right angles to such working face at any point over itsentire area, by rotating the boom 58 on its horizontal axis until theaxis I52 is in a vertical plane parallel to such working face. This maybe accomplished irrespective of the inclination of the arm 21 on itspivot 6| because whenever the axis I52 is in such vertical plane theaxis of the drill is swingable on the axis I52 to a position at rightangles to the working face.

Obviously those skilled in the art may make various changes in thedetails and arrangement of parts without departing from the spirit andscope of the invention as defined by the claims hereto appended, and Iwish therefore not to be restricted to the precise construction hereindisclosed.

Having thus described and shown an embodiment of my invention, what Idesire to secure by Letters Patent of the United States is:

1. In mining apparatus, the combination with a wheel mounted base frame,of a turntable mounted thereon, means for adjusting the elevation andinclination of said turntable, a depending neck mounted on saidturntable to move bodily therewith, a turret mounted on said neck toturn on a horizontal axis extending radially of said turntable andoffset below the top thereof, a second turret mounted on saidfirst-named turret to turn relatively thereto on an axis extending atright angles to the axis of said neck, an elongated support on saidsecond turret, a drill unit demountably attached to the outer endportion of said support, and means for turning the turrets on theirrespective axes to effect adjustments of said support and said drillunit.

2. In a drilling tool. a portable base, a boom swivelly mounted on saidbase to swing horizontally relative thereto about a vertical axis, anarm structure pivotally mounted on the outer extremity of said boom toswing relative thereto, a drilling implement swivelly mounted on theouter extremity of said arm structure to swin relative thereto aboutangularly related axes, and means for swinging said arm structure aboutthe longitudinal axis of said boom to position said drilling implementin relatively high and relatively low planes.

3. In a drilling tool, a portable base, a boom swivelly mounted on saidbase to swing horizontally relative thereto about a vertical axis, anarm structure pivotally mounted on the outer extremity of said boom toswing relative thereto, a drilling implement swivelly mounted on theouter extremity of said arm structure to swing relative thereto aboutrectangularly related axes, and means for swinging said arm structureabout the longitudinal axis of said boom to position said drillingimplement in relatively high and relatively low planes.

4. In drilling machine, the combination with a wheeled frame adapted tomove along a mine track, of a boom mounted on said frame for adjustmentrelative thereto on rectangularly related axes one of which is verticaland the other horizontal, an elongated arm pivoted to said boom foradjustment relative thereto on an axis extending transversely of saidhorizontal axis, a drilling implement at the outer end of said arm,mechanism affording adjustment of said drill implement relative to saidarm on rectangularly related axes one of which shall be in a verticalplane when said transverse axis is horizontal to enable positioning saiddrilling implement at right angles to the working face extending acrossthe space in advance of the mine track and parallel to the ribs, meansfor rotating said boom on said horizontal axis to change the position ofthe drilling implement from a horizontal plane below said arm to ahorizontal plane above said arm, and means for swinging said arm on saidtransverse axis and holding the same in adjusted position.

5. In a track mounted drilling machine, the combination with a wheeledframe having a relatively low overall height adapted to travel on a minetrack in a low roof mine chamber, of a horizontal boom rotatable on ahorizontal axis and mounted on said frame for adjustment relativethereto on a vertical axis, an elongated arm pivotally connected to theouter extremity of said boom for adjustment relative thereto on an axisextending transversely of said boom, a drilling implement, means formounting said drilling implement on said arm for adjustment relativelythereto on rectangularly related axes one of which extends transverselyof said arm in parallelism at all times to said first-named transverseaxis and the other of which is permanently at right angles to thedrilling implement axis, means for swinging said arm on said first-namedtransverse axis and holding the same in adjusted position, and means forrotating said boom together with said arm and drilling implement on saidfirstnamed horizontal axis to position the said right angle axis in avertical plane parallel to the working face extending across the spacein advance of the mine track.

6. In mining apparatus, the combination with a wheel mounted truckadapted to travel on a mine track, of an elongated cutter bar adapted toserve as a support for a drilling machine, a demountable drillingmachine on the outer end portion of said cutter bar, mechanism forsupporting said cutter bar for adjustment on a horizontal axis and onspaced axes one of which is permanently upright and the other of whichvaries from upright to horizontal while remaining permanently at rightangles to said horizontal axis, and means for operating said adjustablesupporting mechanism to effect adjustment of said drilling machine.

'7. In mining apparatus, the combination with a mining machinecomprising a base frame, an elongated cutter bar of a kerf-cutter, meansfor supporting the cutter bar for universal adjustment relative to saidframe, and self-contained power-operated mechanism for operating saiduniversally adjustable supporting means to effect adjustment of thecutter bar, of a drilling machine, and means for adjustably mountingsaid drilling machine on the outer end portion of said cutter bar forbodily movement with the latter when adjusted by said power-operatedmechanism.

8. In mining apparatus, the combination of a mining machine having akerf-cutter cutter bar and means for adjusting the latter, and aself-contained power-operated drilling machine mounted on said cutterbar to move bodily therewith to partake of the adjustments thereof tolocate the drilling machine for operation at a predetermined point atthe coal face.

9. In mining apparatus, the combination with a mining machine comprisinga kerf-cutter cutter bar, of a drilling machine mounted on said cutterbar to partake of the adjustments of the latter and thereby secureadjustment of the drilling machine at the Working face of the mine vein,and power connections to the mining machine and to the drilling machine.

10. In mining apparatus, the combination with a drilling machine unit,of a standard for supporting the same, means affording an annulargrooved track on said standard, an arcuate tongue secured to saiddrilling machine unit and extending into the said grooved track to movearcuately along the same, and a disk secured to said standardconcentrically with said grooved track in position to lock said arcuatetongue in said groove thereby mounting said drilling machine unit onsaid standard for adjustment on an axis extending at right angles to thefeeding axis of said drilling machine unit.

11. In mining apparatus for a low roof mine vein, the combination with aWheeled frame adapted to travel along a mine track, of a sup portpivoted to said frame to swing horizontally relative thereto on avertical axis, a bearing extending radially from said support, asupplemental frame pivotally mounted on said bearing for rotaryadjustment on a horizontal axis permanently at right angles to saidvertical axis, an arm pivotally mounted on said supplemental frame toswing relatively thereto on an axis permanently at right angles to saidhorizontal axis, a drilling implement mounted on the outer end portionof said arm for adjustment relative thereto on rectangularly relatedaxes one of which is permanently parallel to the pivotal axis of saidarm thereby enabling said drilling implement to be adjusted intoposition to drill a hole at right angles to the working face extendingacross the space in advance of the mine track when said arm pivotal axisis horizontal and parallel to such working face, and means for adjustingsaid supplemental frame on said first-named horizontal axis to adjustthe arm pivotal axis to a horizontal plane.

12. In a drilling machine, the combination with a wheeled frame adaptedto travel on a mine track, of a bearing extending radially from saidframe, a supplemental frame mounted on said bearing for rotaryadjustment on a horizontal axis, an elongated support pivotallyconnected to said supplemental frame on an axis extending at rightangles to said horizontal axis, a selfcontained power-operated drillingunit mounted on the outer end portion of said elongated support foradjustment relatively thereto on rectangularly related axes one of whichis permanently parallel to said pivotal axis, means for adjusting saidsupplemental frame on said horizontal axis to move said pivotal axis ina plane permanently at right angles to said horizontal axis, and meansfor adjusting said radial bearing together with said supplemental frameand said elongated support andJsaid. drilling unit on an upright axis toenable said drilling unit to command substantially the entire area ofthe coal face extending across the space in advance of the mine trackwith the drilling axis substantially at right angles to such coal facein the various positions to which adjusted.

, 13. In a drilling machine, the combination with a wheeled frameadapted to travel on a mine track,,of a supplemental frame mounted onsaid first-named frame to swing relatively thereto on an upright axisand to, rotate on a horizontal axis, an arm pivotally mounted on saidsupplemental frame to swing relatively thereto on an axis extendingtransversely of said horizontal axis, a self containe'd power-operateddrilling unit, mechanism for supporting said drilling unit on the outerend portion of said arm for adjustment relatively thereto onrectangularly related axes one of which is permanently in parallelism tosaid transverse axis, mechanism for swinging said arm on said transverseaxis to adjust the position of the drilling unit, and means for rotatingsaid supplemental frame together with said arm and said drilling unit-on said horizontal axis to'invert said drilling unit whereby saiddrilling unitmay be positioned at right angles to the working faceextending across the space in advance of the mine track at any pointover a wide area bet'ween thafloor and roof of the mine room or betweenthe ribs thereof.

l4. In mining apparatus, the combination with a base frame, of aturntable mounted thereon for adjustment relative thereto on'a verticalaxis, a supplemental frame mounted on said turntable for adjustmentrelative thereto on a radially extending horizontal axis, an elongatedsupport pivotally mounted on said supplemental frame for adjustmentrelative'thereto on an axis permanently at right angles to saidhorizontal axis and adjustable to various positions in a vertical planeparallel to and spaced from said vertical axis, a drill unit mountedonthe outer end portion of said elongated support, means for adjustingsaid turntable on said vertical axis to extend the reach of said drillunit arcuately and laterally, means for adjusting said elongated supporton said right angleaxis to extend the reach of said drill unit from thefloor to the roof along the working face whensaid right angle axis ishorizontal, means for adjustably supporting said drill unit on saidelongated support on rectangularly related axes one of which ispermanently parallel to" the transverse pivotal axis of said elongatedsupport, and means for adjusting said supplemental frame relative tosaid turntable on said horizontal axis.

15. In mining apparatus, the combination with a wheeled truck adapted totravel on a mine track, of a turntable mounted thereon for adjustabilitythereto on an upright axis, a radially extending bearing on saidturntable, a turnover head supported by said bearing on said turntablefor bodily movement therewith on said upright axis and for rotaryadjustment relative to said turntable on a radial horizontal axisextending at right angles to said upright turntable axis, an elongatedsupport pivotally mounted on said head for adjustment relative theretoon an axis extending at right angles to said radial axis, a drillingunit, means for adjustably supporting said drilling unit at the outerend portion of said elongated support on rectangularly related axes,mechanism for swinging said elongated support on said pivotal axis, andmeans for rotatably adjusting said head on said radial axis.

16. In mining apparatus, the combination with a wheeled truck adapted totravel on a mine track, of a turntable mounted thereon for adjustmentrelative thereto on an upright axis, means for adjusting the elevationof said turntable relative to said truck, a radially extending bearingon said turntable, a head having a neck mounted on said bearing, meansfor rotating said head by said neck On said bearing on a radial axisextending at right angles to the turntable axis, an elongated supportpivotally connected to said head on an axis extending at right angles tosaid radial axis, a drilling unit, means for adjustably supporting saiddrilling unit on the outer end portion of said elongated support onrectangularly related axes, and means for swinging said elongatedsupport on its pivotal axis.

17. In mining apparatus, the combination with a portable support, of aturntable thereon, means for locking said turntable in its variouspositions of angular adjustment relative to said support, a turn-overhead mounted on said turntable for rotary adjustment relative thereto,an elongated arm pivotally connected to said turn-over head to co-actwith the adjustment thereof relative to said turntable for movement intodifferent lateral positions and different elevated positions relative tosaid support, a drilling tool adjustably mounted on the outer endportion of said elongated arm, motor operated mechanism for adjustingsaid turn-over head relative to said turntable and for adjusting saidarm relative to said turn-over head to enable said cutting tool to bepositioned relative to said arm in parallel posi-' tions eachperpendicular to the working face extending across the space in advanceof said support, and separate motor operated mechanism for operating thedrilling tool in any of said right angle positions.

18. In a drilling machine, the combination with a portable base, of ahead swingable horizontally relatively to said base about a verticalaxis, an elongated arm pivotally mounted on the outer end portion ofsaid head to swing into relatively inclined positions relative thereto,a drilling implement mounted on the outer end portion of said arm foradjustment relatively thereto on rectangularly related axes, motoroperated mechanism for adjusting said head relatively to said base andfor adjusting said arm on its pivot relatively to said head and forholding said arm in adjusted position relative to the base, and motoroperated mechanism for driving said drilling implement.

19. In a mining machine, the combination with a portable base, of aturntable mounted thereon for rotation relatively thereto on an uprightaxis,

means for locking said turntable in adjusted angular position relativeto said base, a head mounted on said turntable for adjustment relativethereto on a horizontal radial axis, an elongated arm pivotallyconnected to said head on an axis extending at right angles to saidhorizontal axis and confined to adjustments in a plane parallel to theVertical axis of the turntable, a drilling unit mounted on the outer endportion of said elongated arm for adjustment relative thereto onrectangularly related axes, and motor operated mechanism for adjustingsaid head on said horizontal axis and for adjusting said elongated armon said transverse axis in cooperation with the adjustments of thedrilling unit on said rectangularly related axes to enable positioningthe drill closely adjacent to the ribs of a mine entry and parallel tosaid ribs with the drill approximately at right angles to the workingface extending across the space in advance of the machine anywhere froma position near the roof to a position near the floor of a mine entry.

20. In a drilling machine, the combination with a portable base having arelatively low overall height, of a support extending outwardly fromsaid base in a horizontal direction, a head mounted on said support forrotary adjustment relative thereto on a horizontal axis spaced below ahorizontal plane extending through the top of said support, an armpivotally connected to said head to swing into relatively inclinedpositions relative thereto on a horizontal axis extending transverselyof said first-named axis, a drilling implement swivelly mounted on theouter end portion of said arm for adjustment relative thereto, andmotor-operated mechanism for rotating said head on its axis and forswinging said arm on its axis.

21. In a drilling machine, the combination with a portable base, of arelatively short horizontal bearing extending outwardly from said base,a head mounted on said short bearing for rotatable adjustment relativethereto, said head having a laterally off-set extension, an elongatedarm pivotally connected to said head on a transverse axis, a drillingunit mounted on said arm for adjustment relative thereto on an axisextending transversely of said arm, means for rotating said head toadjust said arm to a position near the mine bottom, and means forswinging said arm on said transverse axis to locate said drilling unitat the working face near the mine bottom.

22. In a drilling machine, the combination with a portable base, of asupporting frame thereon, a head mounted on said frame for rotatableadjustment relative thereto on a horizontal axis, said head having atransverse extension adapted to project to a position near the minebottom when said head is in a predetermined position, an elongated armpivoted to said head on a transverse axis which is adapted to occupy avertical position when said head is in said predetermined position, adrilling unit pivoted to said arm on a transverse axis adapted to occupya vertical position when said head is in such predetermined position,means for rotating said head on its axis, and means for swinging saidarm horizontally on its axis to enable said drilling unit to occupyvarious positions between the ribs of the mine entry each near the minebottom and each for drilling a hole in the working face either angularlyor perpendicularly relative to the working face.

23. In a drilling machine, the combination with a portable support, of aturntable mounted thereon for rotary adjustment relative thereto on anupright axis, an elongated arm pivotally connected to said turntable ona horizontal axis, a drilling unit connected to the outer end portion ofsaid arm for adjustment relative thereto on rectangularly related axes,motor operated mechanism for swinging said elongated arm in verticalplanes on said horizontal axis while said turntable occupies an adjustedposition relative to said portable base, and self-containedpoweroperated mechanism for operating said drilling unit to drill holesperpendicularly to the working face extending across the space inadvance of the machine parallel to one of the ribs of the mine entry andclosely adjacent thereto at any point extending from a position near theroof to a position near the mine bottom.

24. In a drilling machine, the combination with a portable base, of aturntable mounted thereon, a turn-over head mounted on said turntablefor rotatable adjustment relative thereto on a horizontal radial axis,an elongated arm pivotally connected to said head on an axis extendingtransversely of said horizontal axis, a drilling unit mounted on theouter end portion of said arm for adjustment relative thereto onrectangularly related axes, mechanism for adjusting said turnover headon said horizontal radial axis and for swinging said arm on saidtransverse axis and holding said head and arm in adjusted positionsrelative to said turntable, and self-contained power-operated mechanismfor operating said drilling unit to drill holes closely adjacent eitherrib of the mine entry and parallel thereto and approximatelyperpendicular to the working face extending across the space in advanceof the machine.

25. In a drilling machine, the combination with a wheeled truck adaptedto travel on a mine track, of a turntable mounted thereon, a turntablehead mounted on said turntable for adjustment relative thereto, anelongated fiat bar pivoted to said head on an axis extendingtransversely of the turn-over head axis, a drilling unit mounted on theouter end portion of said fiat elongated arm for adjustment relativethereto on rectangularly related axes, motor operated mechanism foradjusting said turn-over head and for adjusting said flat elongated arm,and motor operated mechanism for operating said drilling unit.

26. In a drilling machine, the combination with a portable base, of ahorizontal support swivelly mounted on said base and overlying said baseand swingable horizontally relatively to said base into positions wherethe outer extremity thereof overhangs the sides of said base, a headpivotally mounted on a horizontal axis on the outer extremity of saidsupport and branching downwardly from said support along either side ofsaid base at the rear of the forward end of said base, an elongated armpivotally connected to the downwardly branching end of said head on avertical axis, a drilling unit swivelled on the outer end portion ofsaid arm to swing about rectangularly related axes additional to saidhorizontal axis, and means for adjusting said head relative to saidsupport and adjusting said arm relative to said head and holding saidarm and head in adjusted positions relative to said support.

27. In a drilling machine, the combination with a portable base, of aturntable mounted thereon for adjustment relative thereto on an uprightaxis, a relatively short bearing mounted on said turntable and extendingradially therefrom, a turn-over head mounted on said short bearing nearsaid turntable, an elongated arm pivoted to said head on an axisextending transversely of the turn-over head axis, a drilling unitpivotally mounted on said arm, and mechanism comprising gearing carriedby said head for rotating the latter on said bearing and for swingingsaid arm on said transverse axis to adjust said arm and hold the same inadjusted position during operation of the drilling unit.

28. In a drilling machine, the combination with a portable base, of asupport pivotally mounted on said base to swing horizontally relativelythereto, a rotatable head mounted on said support outside of theconfines of said base but a short distance therefrom for adjustmentrelative to said base on a horizontal axis, an elongated arm pivotallymounted on said head on an axis at right angles to said horizontal axis,a drilling unit swivelly mounted on the outer end portion of said arm ina position widely spaced from said base for adjustment to either rib ofmine entries of varying widths and to the floor and roof of mine entriesof varying heights, and means for'adjusting said head on said axis andfor adjusting said arm relative to said head and holding the arm inadjusted position.

29. In a drilling machine, the combination with a portable base, of aturntable mounted thereon for adjustment relative thereto on an uprightaxis, mechanism for adjusting the elevation of said turntable relativeto said base, a radial bearing on said turntable, a rotatable headmounted on said bearing and provided with an extension transversely ofthe axis of said bearing, an elongated arm pivoted to said head on atransverse axis at right angles to the axis of said bearing to occupy aposition parallel to said bearing axis and spaced therefrom, mechanismfor rotating said head on said bearing axis while said transverse axisis confined to a plane parallel to the turntable axis, a drilling unitswivelly mounted on said arm to move bodily therewith, and mechanism forswinging said arm on said transverse axis to effect adjustment of theposition of the drilling unit.

30. In a drilling machine, the combination with a truck adapted totravel on a mine track, of a support mounted thereon to rotatehorizontally relatively thereto on a vertical axis, a head journaled tosaid support and having an overhanging extension, an arm pivotallyconnected to said extension, a drilling unit swivelly connected to theouter end portion of said arm on rectangularly related axes, means forholding the drill unit in adjusted positions on said rectangularlyrelated axes, means for holding said support in adjusted positions onsaid vertical axis, means for holding said head in adjusted positionsrelative to said support, and means for holding said arm in adjustedpositions relative to said head, the adjustments on the aforesaid axesenabling said drilling unit to'be positioned at a plurality ofelevations at right angles to a coal face extending transversely of thespace in advance of the mine track.

31. In a drilling machine, the combination with a portable base, of asupport swingable horizon tally relatively to said base about a verticalaxis, an arm swivelled to the outer end of said support to swingrelatively thereto on a horizontal axis, the outer end of said arm beingoffset from said horizontal axis, a drilling implement swivelly mountedon the outer end portion of said arm to swing about rectangularlyrelated axes .'relatively to said arm, means for rotating said arm onsaid horizontal axis to change the elevation of the outer end of saidarm, means for holding said drilling implement in adjusted position onsaid rectangularly related axes, and means for operating the drillingimplement including feed thereof. V

32. In a drilling machine, the combination with a truck adaptedto'travel on a mine track, of a horizontal support mounted on said truckto swing horizontallyv relatively thereto, an arm pivotally mounted onthe outer end of said horizontal support to swing into angularly relatedpositionsinplanes above and below thepivotal connection between said armand said support, a drilling implement mounted on said arm foradjustment relative thereto on rectangularly related axes, meansconnected tosaid support and arm for swinging the latter aboutits pivotrelatively to said support and for holding said arm in its differentangular positions, and means for operating said drilling implementincluding feed thereof parallel to the mine track.

33. In a drilling machine, the combination with a truck adapted totravel on a mine track, of a 1 turntable mounted on said truck .torotate horizontally relatively thereto about a vertical axis, an armstructure pivotally mounted on said turntable to swing relativelythereto, a drilling implement swivelly mounted on the outer end portionof said arm structure to swing relatively thereto about re'ctangularlyrelated axes, and means for swinging said arm structure about a radialhorizontal axis relatively to said turntable to position'the drillingimplement in relatively high and relatively low..planes.

34. In a drilling machine, the combination with a truck adapted totravel on a mine track, a turntable mounted on said truck to rotatehorizontally relatively thereto about a vertical axis, an arm structurepivotally mounted on said turntable to swing relatively thereto onrectangularly related 'axes one ofwhich is a radial horizontal axis, adrilling implement swivelly mounted on theouter end portion of said armstructure to swing relatively thereto about rectangularly related axes,and'means for swinglng'said arm structure about said radial horizontalaxis to position said drilling implement in relatively high andrelatively low planes.

35. In a drilling machine, the combination with a supporting bar, havingouter flat surfaces in parallel spaced-apart planes; of a standardadaptedto fit either flat side of said supporting bar, means fordetachably securing said standard to either flat side of said bar inadjusted position on an'axis extending at right angles to said bar, adrilling unit, and means for pivotally connecting said drilling unit tosaid standard for adjustment relative to said bar on an axis extendingtransversely'of said right angle axis.

36. In a drilling machine, the combination with a supporting bar havingouter surfaces in parallel spaced-apart planes, of an L-'shaped standardhaving plane legs at right angles to each other, a

clamping device extending through a hole in said bar and adapted tosecure one of said legs to either of said outer surfaces, a drillingunit, and means for pivotally supporting said drilling unit on the otherleg of said standard.

3'7. In a drilling machine, the combination with a drilling unit, of asupporting bar, an L-shaped standard,.mechanism securing said standardto said bar in adjusted position relative thereto on an axis at rightangles to said bar, mechanism for mounting said drilling unit on saidstandard for adjustment relative thereto on an axis parallel to said barand extending transversely of said firstnamed axis with the drillingaxis intersecting said right angle axis.

38. In a drilling apparatus, a portable base, a

; boom structure mounted on said base for swinging movement relativethereto, said boom structure solely supported by said base and extendingforwardly in advance of said base, a drill support mounted on the outerextremity of said boom.

structure for rotation aboutthe longitudinal axis of said boomstructure, motor operated devices for swinging said boom structure andfor holding said boom structure in its different adjusted positionsrelative to said base, motor operated devices for rotating said drill,support about its axis relative to the base, and a drilling implementmounted on said drill support for swinging movement relative theretoabout rectangularly related axes.

40. In a drilling apparatus, a portable base, an

N elongated supporting struoturemounted on said base foradjustment in aplurality of a'ngularly related directions relative thereto about spacedaxes one of which is vertical and another horizontaLthehorizontal axislocated on said base in advance of said vertical axis, said supportingstructure extending forwardly in advance of said base, a drilling toolmounted on the outer extremity of said supporting structure, and motoroperated devices for adjusting said supporting structure in aforesaiddirections relative to said base and including a motor for effectingsaid adjustments.

LEWIS E. MITCHELL.

